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11 July, 12:48

What is the speed of light

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  1. 11 July, 13:15
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    In vacuum and empty space, it's 299,792,458 meters per second

    (186,282.4 miles per second).

    In any material stuff, it's somewhat less. How much less depends on

    what stuff it is ... it's different in each material "medium".
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